The journal shows what a player has done in Pokemon Go: which PokeStops the player visited, items obtained from the PokeStops, what Pokemon the player captured, and the dates when the player did those.
How to open journal
1. Tap the Pokeball-shaped icon
Tap the icon at the bottom center of the screen.
2. Tap the sub menu bar
On the menu display, tap the sub menu bar at the bottom right corner.
3. Tap 'JOURNAL' button
By tapping 'JOURNAL' button, you can open the record of your Pokemon adventure and look back your acts.